SuperPro SPF3906K Rear Lower IRS Bump Stop Kit for Pontiac GTO/Holden Commodore

Vehicle Fitment

• 2004-2006 Pontiac GTO (Base)
• 1997-2000 Holden Commodore VT (Calais)
• 2000-2002 Holden Commodore VX (Calais)
• 2002-2004 Holden Commodore VY (Calais)
• 2004-2006 Holden Commodore VZ (Calais)
• 1999-2006 Holden Caprice (WH/WK/WL)

Fitment Notes

• Rear, lower bump stop - specifically for independent rear suspension (IRS) applications
• The Pontiac GTO (2004-2006) is a rebadged Holden Monaro built on the same GM Zeta/V-body platform as the VT-VZ Commodore and WH-WL Caprice/Calais, which is why this bushing applies across both brands
• One retailer's fitment list also included earlier Commodore generations (VN 1988-VS 1997), but those used a live rear axle rather than independent rear suspension, so a bushing specified for the "IRS" position would not apply to them. I've excluded those years here since they conflict with the part's own stated IRS application - confirm your Commodore's rear suspension type (live axle vs. IRS) before ordering if you're outside the VT-VZ range

Features

• OEM-grade polyurethane construction for a precise fit and finish
• Larger diameter than the factory bump stop for improved impact absorption
• Protects rear suspension components from harsh-impact damage
• UV-treated to resist fading and degradation from long-term weather exposure
• Bolt-on installation - no drilling or welding required
• Improves ride quality and reduces harsh clunking on hard suspension compression
• Suitable for street and performance driving applications
• Backed by SuperPro's warranty coverage

Specifications

• Fitting Position: Rear, Lower Bump Stop (IRS)
• Bushing Material: Polyurethane
• Installation: Bolt-on, no drilling or welding required

Included Components

• 2x Rear Bump Stops (one per side)
• Installation hardware

Product Description

The rear lower bump stop cushions the suspension at the end of its compression travel, absorbing the impact of hard bottoming-out over bumps, potholes, or aggressive cornering. Factory rubber bump stops wear down and compress over time, losing their ability to properly cushion that impact and letting harsher hits transfer straight into the chassis. SuperPro's SPF3906K replaces this with a larger-diameter polyurethane bump stop designed to absorb that shock more effectively while resisting the wear and UV degradation that shortens the life of rubber components.

Because the Pontiac GTO is essentially a rebadged Holden Monaro sharing its rear suspension architecture with the VT through VZ Commodore and WH through WL Caprice/Calais, this single bump stop kit covers both the US-market GTO and its Australian platform-mates from the same generation.

This kit suits GTO and IRS-equipped Commodore/Caprice owners looking to improve ride quality and protect their rear suspension from harsh impacts, whether the car sees daily driving, spirited backroad use, or track days. Installation is straightforward and bolt-on, with no drilling or welding required.